Actually Rowan, there is a pressure deflection change from my Speedplay's to a larger platform pedal, but, with the current stiffness of the carbon sole and orthotic, it is only incremental. Pressure=Force/Area. Think of a 6" square surface of aluminium foil. One pound of pressure applied to the end of a needle would easily pierce the foil. However, if the same one pound of pressure was equally distributed across the entire 6" square surface, the foil would easily support the weight.